Bead for outer casings for pneumatic tires.



F. W. KREIVIER.

BEAD FOR OUTER cAslNes EUR PNEUMATIC TIRES.

APPLICATION FILED MM 22. I9I3 PIII-@um om. 31, mm.

In verdor FRANKLIN WILLIAM inanivinn,

OF CARLSTADT, NEW JERSEY.

BEAD ron ou'rna casiivies ron Pianura/tario Treas.

incassa. f

Specification of Letters Patent.

Patented ct. 3l, 1916..

. JApplication led May 22, 1913. Serial No. 769,231.

To all wwmz't may concern Be it known that l, FRANKLIN W. Kanarien, acitizen of the United States, re-

` siding at Carlstadt, in the 'county of Bergen and State of New Jersey,have invented a new'and useful Bead for Outer Casings of PneumaticTires, of which the following is a specification.

The present rinvention relates to improvements in beads for outereasings of pneumatic tires, the primary object of the same being theproduction of a bead in which a plurality of strands of wire aredisposed in parallel relation so that the traction strain will be thrownupon all of said strands equally, said strands being preferably composedof a non-stretchable wire, such as piano wire, and being eoatedor heldtogether b v means of a plurality of layers of spirally wound tape, saidtape being provided with an adhesivewvliich"due to the/ compression ofthe tape in winding about the strands is forced into the intersticesbetween the strandsso that when the bead is properly vulcanized withinthe rim engaging portions of the outer casing` a homogeneous vulcanizedmember will be produced.

A ,further object ot' the present invention is the provision of afbeadwhich is either circular or triangular in cross section, ace eordingtothe use to which it is to be placed.

lith the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the eonibination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes iii the preciseembodiment ot the invention herein disclosed can be 'made within thescope. of what is claimed without departing from the spirit ofthe'inventiou.

ln the drawings-Figure l is a side elevation illustrating the primarystep in forming the coils of the bead. Fig. Q- is a. section on line Q-Qof Fig. 1. Fig. Bis an enlarged detail View of the splice employed forcon iiecting the free terminals of the strands together. Fig. l is alongitudinal sectional view through the tape wound bead before thevulcanizing step. Fig. 5 is a cross section thereof. Fig. (i is anenlarged detail view of a vulcanized circular bead. Fig. 7 is a crosssection therethrough. Fig. 8 is an enlarged View of a trian ularvulcanized bead. Fig. 9 is a cross section therethrough. Fig. 10 is anenlarged detail sectionalvew showing the triangular bead embedded with;in the riinengaging portion of an outer casina.

Referring to the drawings, and reciting y the process from its initialstep to the tinislied article, the piano wire has one terminal bent asat 1 and inserted within the peripheral socket 2 of the reeling wheel 3.said wheel being provided with the strand forming portion so that thestrands L1, preferably tive in number may be positioned as clearly shownin Figs. 1 and 2, so as to provide the overlapping end 5. which due tothe gage notch is extended the desired distance to produce tli'esutiicient splice as at 5-5 Fig. 3. i A

When the st `ands are foimed as shown in Figs. 1 and 2. the beaded tape(not shown) is wound about the strands at two points beyond the strand land the end of the termi. nal 5, so that said strands are held in theproper relative position and shapef The terminal constituting the bentportion 1 is straightened and the terminals 1 and 5 are then placed in awinding machine, and .Y

twisted as indicated in Fig. 3, after which the adjacent faces of theoverlapping ends are soldered together to produce a homogeneous splice.The thus fastened metal bead is then placed in the grooved wheels ofthebead forming machine set forth in a co-.

pending application Serial No. 7 69,982 tiled ture as to be saturatedwith an adhesiveA substance containing a body of unvulcanized rubber.Sufficient pressure is placed upon the tape during the wiiidingthereofupon the metal strands to force said sticky sub1- stance into theinterstices between the wires, the purpose of which will presentlyappear.

After the inner layers of tape, the said innei-.layers being composed ofa single tape wound to overlap. are suiiciently wound August 18. 1914.and has first wound thereupon the full length of the bead, the bead islremoved and an outer tape is wound so as to form the two layers 7, thespiral winding of the same being in an opposite direction to the spiralWinding of the layers 6, thus producing a means to retain the strands lof the metal bead in the proper alined and parallel position atlalltimes.. The tape wound bead is now placed-in a-inold, which is providedwith cav-ties,;such cavities conforming in crosssection to 'the desiredshape of the bead. This mold is preferably constructed with sufficientcavities to take all sizes of a given profile'. The mold is then placedin a' curing' process and semi-cured under pressure, this semi-curing-causing the gum to flow and till the interstices between the strands.The bead is allowed to 'remain under heat and pressure a sufficientlength of time to partially vulcanize the rubber, the partialvulcanizing serving to solidify the bead. This step is an exceedinglyimportant one, as there is insutlieient pressure brought to bear uponthe bead after it is placed within the rim engaging portion of the outertire casing, to properly solidify the bead.

The thus formed bead, as clearly shown in Figs. 4 and 5, is coated withunvuleanized rubber 8 to form the bead as shown in Figs. 6 and 7 the'same being notfullv vulcanized so that when inserted within the rimengaging portions 10 of the outer casing, as illustrated in Fig. 10, thesaine is fully vulcanized with the rubber'- thereof so as to form inrealityt an integral masswith the rim engaging portion 10 'and with thestrands 4.01 Wire disposed centrally thereof and in the portion thereofwhich will render the bead more durable and eiiicient. y

The form of bead, as shown in Figs. 8, 9 and 10, is of triangular shapein cross section, the tape portions 6 and 7 being Wound upon thestrandsi, as illustrated, and above described, and embedded in the unvulcanizedrubberas at t) in Figs. 8 and 9 and positioned within the rim engagingportion of the tire as shown in Fig. 10 to be vulcanized to form ahomogeneous mass therein.

thus increasing the life of the tire, and being more practical anddurable than is a twisted or braided Wire bead.

What is claimed is:

1. A reinforcing element for a tire bead, comprising a plurality ofstrand elements bound closely together with a spirallv wound, overlappedtape carrying an adhesive which enters between certain of the strandelements, the adhesive being partially vulcanized.

2. A reinforcins.lr element for a tire bead, comprising a plurality ofstrand eleineilts: a spirally wound, overlapped tape inclosing thestrand elements; and a second tape inclosing the first and spirallywound thereon in a reversed direction in overlapped convolutions, bothtapes being coated with a vulcanizable adhesive. l

In testimony that I claim the foregoing as my own, I have hereto ailixedmyA signature in the presence of two witnesses.

FRANKLIN WILLIAM KREMER.

Witnesses:

C.v D. N IxoN, W. B. LEVAN.

